package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.entity.Setmeal;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.beans.Beans;
import java.util.ArrayList;
import java.util.List;

@Service
@Slf4j
public class DishServiceImpl  implements DishService {

    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private DishFlavorMapper dishFlavorMapper;

    @Autowired
    private SetmealDishMapper setmealDishMapper;

    @Autowired
    private SetmealMapper setmealMapper;

    /**
     * 新增菜品
     * @param dishDTO
     */
    @Override
    @Transactional//事务注解， 保证数据一致性，保证整个方法是一个原子性的，要不全成功，要不全失败
    public void saveWithFlavor(DishDTO dishDTO) {

        Dish dish = new Dish();

        BeanUtils.copyProperties(dishDTO,dish);
        //向菜品表来插入1条数据
        dishMapper.insert(dish);

        //获取生成的主键值
        Long dishId = dish.getId();

        //向口味表插入n条数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && flavors.size() > 0){
            //lamada表达式遍历
            flavors.forEach(dishFlavor -> dishFlavor.setDishId(dishId));
            dishFlavorMapper.insertBatch(flavors);

        }

    }

    /**
     * 菜品分页查询
     *
     * @param dishPageQueryDTO
     * @return
     */
    @Override
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {
        PageHelper.startPage(dishPageQueryDTO.getPage(), dishPageQueryDTO.getPageSize());
        Page<DishVO> page = dishMapper.pageQuery(dishPageQueryDTO);
        return new PageResult(page.getTotal(), page.getResult());

    }

    /**
     * 批量删除菜品
     *
     * @param ids
     */
    @Override
    @Transactional
    public void deleteBatch(List<Long> ids) {

        //判断当前菜品是否能够被删除 ---是否存在起售中的商品
        for (Long id : ids) {
            Dish dish = dishMapper.getById(id);
            if(dish.getStatus().equals(StatusConstant.ENABLE)){
                //起售中的菜品不能删除
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }
        //判断当前菜品是否能够删除 --- 是否关联套餐
        List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(ids);
        log.info("关联套餐的id为：" + setmealIds);
        if(setmealIds != null && setmealIds.size() > 0){
            //存在关联套餐
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }


//        //删除菜品表中的菜品数据
//        for (Long id : ids) {
//            dishMapper.deleteById(id);
//            //删除菜品关联的口味数据
//            dishFlavorMapper.deleteByDishId(id);
//        }

        //批量删除菜品表中的菜品数据
        dishMapper.deleteByIdBatch(ids);

        //批量删除菜品关联的口味数据
        dishFlavorMapper.deleteByDishIdBatch(ids);


    }

    /**
     * 根据id查询菜品和对应的口味数据
     *
     * @param id
     * @return
     */
    @Override
    public DishVO getByIdWithFlavor(Long id) {
        //根据id查询菜品数据
        Dish dish = dishMapper.getById(id);

        //根据dishId查询口味数据
        List<DishFlavor> dishFlavors = dishFlavorMapper.getByDishId(id);

        //封装为DishVO对象并返回
        DishVO dishVo = new DishVO();
        BeanUtils.copyProperties(dish,dishVo);
        dishVo.setFlavors(dishFlavors);
        return dishVo;
    }

    /**
     * 根据id修改菜品基本信息和口味信息
     * @param dishDTO
     */
    @Override
    @Transactional
    public void updateWithFlavor(DishDTO dishDTO) {

        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);
        //修改菜品表
        dishMapper.update(dish);
        //删除菜品口味表中的数据（先删除后插入）
        dishFlavorMapper.deleteByDishId(dishDTO.getId());
        //添加新的菜品口味数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && flavors.size() > 0){
            //lamada表达式遍历
            flavors.forEach(dishFlavor -> dishFlavor.setDishId(dishDTO.getId()));
            dishFlavorMapper.insertBatch(flavors);

        }


    }

    /**
     * 启用停用菜品
     *
     * @param status
     * @param id
     */
    @Override
    @Transactional
    public void startOrStop(Integer status, Long id) {
        Dish dish = Dish.builder()
                .id(id)
                .status(status)
                .build();
        dishMapper.update(dish);

        //如果是停售，则需要判断当前菜品是否关联了套餐，如果已经关联，则需要将套餐的起售状态改为停售
        if(status.equals(StatusConstant.DISABLE)){
            List<Long>  dishIds = new ArrayList<>();
            dishIds.add(id);
            List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(dishIds);
            if(setmealIds != null && setmealIds.size() > 0){
                //需要将套餐的起售状态改为停售
                for (Long setmealId : setmealIds) {
                    Setmeal setmeal = Setmeal.builder()
                            .id(setmealId)
                            .status(StatusConstant.DISABLE)
                            .build();
                    setmealMapper.update(setmeal);
                }
            }
        }

    }

    /**
     * 根据分类id查询菜品
     *
     * @param dishDTO
     * @return
     */
    @Override
    public List<Dish> list(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);
        return dishMapper.list(dish);
    }

    /*@Override
    public List<Dish> list(Long categoryId) {
        Dish dish = Dish.builder()
                .categoryId(categoryId)
                .status(StatusConstant.ENABLE)
                .build();
        List<Dish> list = dishMapper.list(dish);
        return list;
    }*/


    /**
     * 条件查询菜品和口味
     * @param dish
     * @return
     */
    @Override
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }


}
